macOS doesn't make it easy to see how much juice is left in your AirPods, Magic Mouse, MX keyboard, PS5 controller, or any other Bluetooth peripheral. Some of it is buried in System Settings → Bluetooth, some of it never shows up at all, and most of the third-party tools that fix this are paid or come with analytics baked in. I wanted a tiny free thing that just worked, so I built MacJuiceMonitor . what it does A small Electron app that lives in the macOS menu bar and polls every connected Bluetooth device for its current battery percentage. AirPods, headphones, mice, keyboards, game controllers — anything that reports battery — shows up in a single dropdown, with the percentage right next to each device's name. You can also pick one device whose battery the tray icon itself mirrors, so the number you actually care about (usually the AirPods, in my case) is visible at a glance without opening anything.…